Add release notes for v0.215.0

Author: sapphirew

docs/release_notes/0.215.0.md

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+# Release v0.215.0
+
+## 🚀 Features
+
+- automatic security group tagging for karpenter (#8501)
+
+## 🎯 Improvements
+
+- fix: karpenter tagging, addons and flaky integration tests (#8508)
+
+## 🐛 Bug Fixes
+
+- fix: Add exact match check to use specified addon versions (#8510)
+- fix: Fix GPU instance filtering when --instance-selector-gpus=0 (#8506)
+- fix: use latest managed addon version for kube-proxy image name (#8505)
+
+## 🧰 Maintenance
+
+- Update ec2-info (#8454)
+
+## 📝 Documentation
+
+- Revert Add scheduled maintenance announcement for eksctl.io (#8500)
+- Add scheduled maintenance announcement for eksctl.io (#8498)
+
+## Acknowledgments
+
+The eksctl maintainers would like to sincerely thank @sapphirew.
+